they can survive in both brackish and fresh water and they don't need land its just more comfortable for them if they have some. I kept 4 in a 10gal for about 8months with no land and all freshwater with guppies and mollies and i had no problem. Theyre really cool to have and theyre ok to handle so have fun with them
Well I've had this little guy for about 7 months, and he's in perfectly clean water with no land area, and he grows, moves around, eats... He's a happy little crab. I know he will be fine in the water with the conditions, I just wasn't sure if he would eat the wee little fish.